it blows up and down, up and down
Gets larger
The particles change mean speed and concentration.
The speed increases. The object accellerates positively in the direction of motion.
-It increases
It slows down.
They don't get bigger, but their mass increases significantly. -- At 99% of the speed of light, an object's mass is about 7.1 times the mass that it has when it's not moving. -- At 99.99% of the speed of light, its mass is about 70.7 times the mass that it has when it's not moving.
increased.
increased.
no
The average speed of the particles decreases.
It increases.
It increases.
Temperature IS the (average) speed of movement of the particles (molecules) that make up an object. The more heat you add to an object, the faster the molecules move (vibrate). There are devices (thermometers) that indirectly measure this speed, and thus report the temperature.
Gets larger
Gets larger
The particles change mean speed and concentration.
If speed approaches the speed of light, the mass of any object will increase. This is not just theory; it is observed on a daily basis. Not with spaceships, of course; the technology is not ready yet - but with subatomic particles in accelerators.